Leviticus 20:12
And if a man lays with his daughter-in-law, both of them shall surely be put to death. They have wrought perversion. Their blood shall be upon them.
Leviticus 18:15
Thou shall not uncover the nakedness of thy daughter-in-law. She is thy son's wife. Thou shall not uncover her nakedness.
Leviticus 18:23
And thou shall not lay with any beast to defile thyself with it, nor shall any woman stand before a beast, to lay down with it. It is a perversion.
Genesis 38:16
And he turned to her by the way, and said, Come, I pray thee, let me come in to thee, for he did not know that she was his daughter-in-law. And she said, What will thou give me, that thou may come in to me?
Genesis 38:18
And he said, What pledge shall I give thee? And she said, Thy signet and thy cord, and thy staff that is in thy hand. And he gave them to her, and came in to her, and she conceived by him.
Deuteronomy 27:23
Cursed be he who lays with his mother-in-law. And all the people shall say, Amen.